Process for the preparation of polyvinyl chloride foams

Details Process for the preparation of polyvinyl chloride foams Process for the preparation of polyvinyl chloride foams

1976-03-23

1977-04-05

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25AH, 260 25S, 260 465R, 260 465Y, 260 465UA, C08J 930

Patent

active

040161161

ABSTRACT:
Organopolysiloxane copolymers comprising units of the general formulae ##STR1## wherein R represents an alkyl group with 1 to 3 carbon atoms or a vinyl group, R' represents a divalent hydrocarbon radical with 1 to 10 carbon atoms, Q represents an organic radical of the formula --OG, ##STR2## or --OSiR.sub.3 in which G represents an alkyl radical with 1 to 4 carbon atoms, and each R group, which may be identical or different, is as defined above, n represents 2, 3 or 4, the C.sub.n H.sub.2n group being straight or branched and y represents a number from 4 to 60; the C.sub.n H.sub.2n groups being the same or different, the ratio of the number of (CH.sub.3).sub.2 RSiO.sub.0.5 units to the number of SiO.sub.2 units being 0.55:1 to 0.75:1 and the ratio of the number of ##STR3## units to the number of SiO.sub.2 units being 0.005:1 to 0.1:1 are used as stabilizers in the preparation of open-cell polyvinyl chloride foams. The raw foams can be easily shaped or moulded prior to gelling and gel without gain of density.

REFERENCES:
patent: 3511788 (1970-05-01), Keil
patent: 3730931 (1973-05-01), Simoneau et al.
patent: 3796676 (1974-03-01), Kanner et al.
patent: 3814706 (1974-06-01), Simoneau et al.
patent: 3833512 (1974-09-01), Prokai et al.

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